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Definition: Def. 11.19: Axis of a Cone

(Definition 19 from Book 11 of Euclid's “Elements”)

And the axis of the cone is the fixed straight line about which the (right-angled) triangle (constructing the cone) is turned.

Modern Formulation

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Definitions: 1 2

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References

Adapted from (subject to copyright, with kind permission)

  1. Fitzpatrick, Richard: Euclid's "Elements of Geometry"

Adapted from CC BY-SA 3.0 Sources:

  1. Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016